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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bdda78b819591f81254c4b0e31e570652d11f5b6c4ea1182f866e03cb4340d' 
  AND token = 'XYGTYTNR2Mj1KmbqiuS6Nme3NsIEmIktvA1hcsvXuNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}